How can I modify the EXIF orientation tag of an image?

Question

I am uploading programmatically a report on the server through the use of rs.exe and a visual basic file. When the user views the report, the server asks for credentials to log in to the Data Source.

Now, when I upload a report through Visual Studio, there is an option to use specific credentials that you can pre-set so the user is not prompted. I also notice that there is a setting in the report where you can define credentials.

My question is, how do I enable the use of specific data source credentials on uploading the report with Visual Basic so the user is not prompted for the data source credentials?

My VB code:

Public Sub Main()
    Try
        Dim definition As [Byte]() = Nothing
        Dim warnings As Warning() = Nothing
        Dim stream As FileStream = File.OpenRead(RDL_LOCATION)

        definition = New [Byte](stream.Length) {}
        stream.Read(definition, 0, CInt(stream.Length))
        warnings = rs.CreateReport(REPORT_NAME, "/" + REPORT_FOLDER, True, definition, Nothing)
        If Not (warnings Is Nothing) Then
            Dim warning As Warning
            For Each warning In warnings
                Console.WriteLine(warning.Message)
            Next warning
        Else
            AddPolicies("/" + REPORT_FOLDER + "/" + REPORT_NAME, "False")
            Console.WriteLine("Report: {0} PUBLISHED!", REPORT_NAME)
        End If
    Catch e As IOException
        Console.WriteLine(e.Message)
        Console.Read()
    End Try
End Sub

Solution 1

You can retrieve the existing orientation information via exiftool as follows:

exiftool -Orientation -n image.jpg

This will display the internal value of the orientation information held in the MIE tags. You can return the value as an English string by omitting the -n flag. You can find additional information here regarding particular rotation/orientation values.

Changing the orientation data with exiftool can be done as follows:

exiftool -Orientation=1 -n image.jpg

Here, the orientation is set to 1, indicating no rotation. These numbers are defined as per the EXIF specification; you can see what effect different rotation values have in the link above.

(note: you must use the -n argument when setting orientation to indicate that the value is numeric. If you forget, exiftool will interpret the orientation=x number as a string and set the wrong rotation ie. exiftool -orientation=1 image.jpg will actually set the orientation to 3 which is 'Rotate 180')

Solution 2

My solution was the same as @Breakthrough, but I had to put the -n before -Orientation, such as

exiftool -n -Orientation=1 image.jpg